This application claims priority to Japanese Patent Application No. 2008-321038, filed Dec. 17, 2008, in the Japanese Patent Office. The Japanese Patent Application No. 2008-321038 is incorporated by reference in its entirety.
TECHNICAL FIELDThe present disclosure relates to a semiconductor apparatus and a manufacturing method thereof, and more particularly to a resin-sealed semiconductor apparatus in which a semiconductor chip is received between stacked wiring substrates and a gap between the wiring substrates is filled with a resin, and a manufacturing method of the semiconductor apparatus.
RELATED ARTThere are various semiconductor apparatuses. Description in which plural substrates, on each of which an electronic component is mounted, are stacked on a substrate, on which an electronic component is mounted through a solder ball, and a gap between the substrates is sealed with a resin is made in Patent Reference 1.
Also, description in which one wiring substrate is stacked and connected on the other wiring substrate by a solder ball and a first electronic component is mounted on one wiring substrate and a second electronic component is received in an opening part of the other wiring substrate and a gap between a pair of the wiring substrates is sealed with a resin is made inPatent Reference 2.
Also, description in which a second substrate is stacked and connected on a first substrate on which a semiconductor chip is mounted through a solder ball and a gap between the first and second substrates is filled with a molding resin is made in Patent Reference 3.
[Patent Reference 1] JP-A-2003-347722
[Patent Reference 2] JP-A-2008-159956
[Patent Reference 3] WO 2007/069606 A1
As described in a column of a related art described below, there is a resin-sealed semiconductor apparatus constructed by stacking and connecting a second wiring substrate on a first wiring substrate on which a semiconductor chip is mounted by flip chip bonding through a bump electrode and filling a gap between the wiring substrates with a molding resin.
In such a semiconductor apparatus, the semiconductor chip is thinned to 100 μm or less by grinding in order to achieve thinning of the whole apparatus. As a result of this, a minute crack often occurs in a grinding surface (upper surface) of the semiconductor chip and in order to remove the crack, polishing processing is performed on the grinding surface of the semiconductor chip. For example, a buffing (that is a polishing using a polishing cloth, which is provided with diamond or polishing paste such as aluminum oxide and the like, or which is soaked into slurry) is performed as the polishing processing.
Since the molding resin is formed on a mirror surface of the semiconductor chip, it is difficult to obtain high adhesion properties by an anchor effect and there is a problem of forming the molding resin in a state of low adhesion properties with respect to the semiconductor chip. As a result of that, when moisture absorbed by the semiconductor apparatus vaporizes and volume expansion is caused, peeling occurs at an interface between the molding resin and the semiconductor chip with low adhesion properties and thus, there is fear of leading to destruction of the semiconductor apparatus.
SUMMARYExemplary embodiments of the present invention provide a semiconductor apparatus capable of obtaining sufficient reliability by improving adhesion properties in a semiconductor apparatus of a structure in which a thinned semiconductor chip is mounted between wiring substrates and is sealed with a resin, and a manufacturing method of the semiconductor apparatus.
A semiconductor apparatus according to the exemplary embodiment of the present invention, comprises:
a first wiring substrate;
a second wiring substrate which is stacked and connected on the first wiring substrate through a bump electrode;
a semiconductor chip which is mounted on the first wiring substrate by flip chip bonding and received between the first wiring substrate and the second wiring substrate, an upper surface of the semiconductor chip being subject to a mirror treatment;
an adhesive layer which is formed on the upper surface of the semiconductor chip; and
a molding resin which is filled in a gap between the first wiring substrate and the second wiring substrate.
In the case of manufacturing a semiconductor apparatus of the invention, a semiconductor chip, an upper surface of which is subject to the mirror treatment, is first mounted on a first wiring substrate by flip chip bonding. The semiconductor chip is obtained by dicing a silicon wafer after a back surface of the silicon wafer in which an element forming region is disposed in the front surface side is ground to make the silicon wafer thin and mirror treatment is performed. The mirror treatment is performed in order to remove a minute crack occurring by grinding. In this manner, the semiconductor chip, the upper surface of which is subject to mirror treatment, is obtained.
In the semiconductor chip in which mirror treatment is performed, an anchor effect becomes resistant to working, so that adhesion properties of a layer (a molding resin etc.) formed on the semiconductor chip become worse. Because of this, an adhesive layer is formed on the upper surface (mirror surface) of the semiconductor chip in the invention. As the adhesive layer, a coupling material or a resin without including a mold release material is suitably used.
Then, a second wiring substrate is stacked on the first wiring substrate through a bump electrode and the semiconductor chip is received in a receiving part between the first wiring substrate and the second wiring substrate. At this time, it may be constructed so that a gap occurs between the adhesive layer on the semiconductor chip and a lower surface of the second wiring substrate or the adhesive layer on the semiconductor chip makes contact with the lower surface of the second wiring substrate.
Further, a gap between the first wiring substrate and the second wiring substrate is filled with a molding resin and the semiconductor chip is sealed with the resin. When a gap is disposed between the adhesive layer on the semiconductor chip and the lower surface of the second wiring substrate in the case of stacking the second wiring substrate, it is sealed with the resin so that the molding resin is interposed between the adhesive layer and the second wiring substrate.
In the semiconductor apparatus of the invention, the adhesive layer is disposed on the semiconductor chip, so that even when the upper surface of the semiconductor chip is a mirror surface without having the anchor effect, the molding resin formed on its surface is formed with sufficient adhesion properties. Or, when the adhesive layer on the semiconductor chip makes contact with the second wiring substrate, the second wiring substrate is arranged with sufficient adhesion properties by the adhesive layer on the semiconductor chip.
Therefore, even when moisture absorbed by the semiconductor apparatus vaporizes and volume expansion is caused, an interface of the upper surface side of the semiconductor chip has sufficient adhesion properties, so that peeling is prevented from occurring at their interfaces. Consequently, reliability of the semiconductor apparatus can be improved.
As mentioned above, in the present invention, it is possible to obtain sufficient reliability by improving adhesion properties in a semiconductor apparatus of a structure in which a thinned semiconductor chip is mounted between wiring substrates and is sealed with a resin.
Other features and advantages may be apparent from the following detailed description, the accompanying drawings and the claims.
BRIEF DESCRIPTION OF THE DRAWINGSFIGS. 1A to 1C are sectional views showing a manufacturing method of a semiconductor apparatus of the related art.
FIGS. 2A to 5 are sectional views showing a manufacturing method of a semiconductor apparatus of a first embodiment of the invention.
FIGS. 6A to 7B are sectional views showing a manufacturing method of a semiconductor apparatus of a second embodiment of the invention.
DETAILED DESCRIPTIONEmbodiments of the invention will hereinafter be described with reference to the accompanying drawings.
Related ArtA problematical point of a related art related to the invention will be described before the embodiments of the invention are described.FIGS. 1A to 1C are sectional views showing a manufacturing method of a semiconductor apparatus of the related art.
As shown inFIG. 1A, flip chip bonding between a wiring layer (not shown) of afirst wiring substrate100 and aconnection electrode220 of asemiconductor chip200 is first made. Thesemiconductor chip200 is thinned to a thickness of 100 μm or less and polishing processing of its upper surface is performed.
Thereafter, a gap between the lower side of thesemiconductor chip200 and an upper surface of thefirst wiring substrate100 is filled with anunder fill resin300. Then, as shown inFIG. 1B, asecond wiring substrate400 is stacked and connected on thefirst wiring substrate100 throughbump electrodes240 arranged so as to surround a receiving part A of thesemiconductor chip200. A height of thebump electrode240 is set higher than a height of thesemiconductor chip200 and thesemiconductor chip200 is received in the receiving part A between thefirst wiring substrate100 and thesecond wiring substrate400.
Then, a gap between the first and thesecond wiring substrates100 and400 is filled with a resin by a transfer molding construction method using a molding mold. Consequently, as shown inFIG. 1C, thesemiconductor chip200 received between the first and thesecond wiring substrates100 and400 is sealed with amolding resin260.
Thereafter, external connection terminals280 are disposed by installing solder balls etc. in a wiring layer (not shown) of the lower surface side of thefirst wiring substrate100. Consequently, a resin-sealed semiconductor apparatus5 of the related art is obtained.
In the resin-sealed semiconductor apparatus5, thinning of the whole apparatus is desired, so that it is necessary to set thesemiconductor chip200 as thin as possible. Thesemiconductor chip200 is obtained by dicing a silicon wafer after a back surface of the silicon wafer in which an element forming region is disposed in the front surface side is ground by a grinder to make the silicon wafer thin to a necessary thickness.
At this time, a minute crack often occurs in a grinding surface of thesemiconductor chip200 and as thesemiconductor chip200 is thinned, the crack advances in a mounting step etc. and thesemiconductor chip200 may be destroyed.
As this countermeasure, polishing processing is performed by wet polishing etc. after the back surface of the silicon wafer is ground. Consequently, thesemiconductor chip200, the upper surface of which is subject to polishing processing as described above, is obtained.
In the semiconductor apparatus5 (FIG. 1C) of the related art, the upper surface of thesemiconductor chip200 becomes a mirror surface and smoothness is high, so that sufficient adhesion properties of themolding resin260 by an anchor effect are not obtained and there is a problem of low adhesion properties between thesemiconductor chip200 and themolding resin260. As the upper surface of thesemiconductor chip200 is smooth, a contact area of themolding resin260 per unit area becomes small, so that the anchor effect becomes weak.
Also, this results from the fact that themolding resin260 has lower adhesion properties to the semiconductor chip200 (silicon) than other resins such as the underfill resin300 since themolding resin260 includes a mold release material (wax) in order to be easily detached from the molding mold.
When the semiconductor apparatus5 absorbs moisture, moisture tends to gather at an interface with which a material with low adhesion properties makes contact. Then, the moisture evaporates (vaporizes) by heating treatment such as a step of making connection to a mounting substrate by reflow heating of the external connection terminals280 and thereby, volume expansion is caused and force of pushing up a film is applied. At this time, it is in a state of low adhesion properties between thesemiconductor chip200 and themolding resin260, so that peeling occurs at its interface and thus, the semiconductor apparatus5 may be destroyed.
When thesemiconductor chip200 is sealed with themolding resin260 in a state of exposing the upper surface of the semiconductor chip200 (in the absence of the second wiring substrate400), a method for improving adhesion properties of themolding resin260 by ashing treatment of the upper surface of thesemiconductor chip200 can be adopted.
However, in the related art, thesecond wiring substrate400 is present on thesemiconductor chip200, so that the ashing treatment cannot be performed sufficiently with respect to the upper surface of thesemiconductor chip200 and it is difficult to adopt a technique for improving adhesion properties by the ashing treatment.
A manufacturing method of a semiconductor apparatus of the present embodiment described below can solve the trouble described above.
First EmbodimentFIGS. 2 to 5 are sectional views showing a manufacturing method of a semiconductor apparatus of a first embodiment of the invention. In the manufacturing method of the semiconductor apparatus of the first embodiment, afirst wiring substrate10 as shown inFIG. 2A is first prepared. In thefirst wiring substrate10, a through hole TH is disposed in acore substrate12 made of an insulating material such as a glass epoxy resin. Wiring layers20 mutually connected through a throughelectrode14 with which the inside of the through hole TH is filled are respectively formed on the sides of both surfaces of thecore substrate12.
Or, the wiring layers20 may be mutually connected through a through hole plated layer (through electrode) disposed on an inner wall of the through hole TH of thecore substrate12 and a hole of the through hole TH may be filled with a resin.
Further, solder resists16 in which openingparts16aare disposed on connection parts of the wiring layers20 are respectively formed on the sides of both surfaces of thecore substrate12. A contact part (not shown) is disposed by, for example, forming a Ni/Au plated layer in the connection part of thewiring layer20.
In an example ofFIG. 2A, the wiring layers20 of one layer are respectively formed on both surfaces of thecore substrate12, but the number of stacks of the wiring layer formed on thecore substrate12 can be set arbitrarily. Also, a coreless wiring substrate without having thecore substrate12 may be used.
Then, as shown inFIG. 2B, flip chip bonding between aconnection electrode32 of a semiconductor chip30 (LSI chip) and the connection part of thewiring layer20 of the upper surface side of thefirst wiring substrate10 is made. Further, as shown inFIG. 2C, a gap between thesemiconductor chip30 and thefirst wiring substrate10 is filled with an underfill resin18.
As described in the related art mentioned above, thesemiconductor chip30 is obtained by dicing a silicon wafer after a back surface of the silicon wafer in which an element forming region is disposed in the front surface side is ground by a grinder to make the silicon wafer thin to a necessary thickness.
After the silicon wafer is thinned to a thickness of 100 μm or less (for example, 50 to 60 μm), polishing processing of its grinding surface is performed by wet polishing etc. An upper surface of thesemiconductor chip30 ofFIG. 2B corresponds to the grinding surface side of the back surface of the silicon wafer.
The reason why the upper surface of thesemiconductor chip30 becomes a mirror surface is because a minute crack often occurs in the grinding surface (upper surface) of the thinnedsemiconductor chip30 and, for example, when thesemiconductor chip30 is mounted, the crack advances and destruction may be caused as described in the related art. Because of that, in thesemiconductor chip30, polishing processing of the grinding surface (upper surface) is performed and the minute crack is removed.
Surface roughness (Ra) of the grinding surface (upper surface) of thesemiconductor chip30 obtained based on grinding of the silicon wafer by the grinder is about 0.1 mm (100 μm). On the other hand, surface roughness (Ra) of the mirror surface (upper surface) of thesemiconductor chip30 obtained based on polishing processing of its grinding surface after the silicon wafer is ground by the grinder becomes 8 to 12 μm (about 10 μm).
Thus, a difference between the surface roughnesses (Ra) of the mirror surface on which polishing processing is performed and the grinding surface by the grinder is about 10 times and it is understood that the surface is remarkably smoothed by performing the polishing processing.
In the embodiment, polishing processing of the upper surface of thesemiconductor chip30 is performed and the surface roughness (Ra) becomes small, so that an anchor effect becomes resistant to working in the case of sealing thesemiconductor chip30 with a molding resin and adhesion force of the molding resin reduces.
Hence, in the embodiment, anadhesive layer40 is formed on the upper surface of thesemiconductor chip30 as shown inFIG. 3A. As a suitable material of theadhesive layer40, there is the same resin as the under fill resin used in a step ofFIG. 2C.
Unlike a molding resin described below, a mold release material (wax) is not included in the under fill resin, so that sufficient adhesion properties to the semiconductor chip30 (silicon) are obtained. Such a resin without including the mold release material (wax) is applied to the upper surface of thesemiconductor chip30 and heating treatment is performed in an atmosphere of temperature of 150 to 200° C. and the resin is cured and thereby, theadhesive layer40 is obtained.
Also, the resin without including the mold release material used as theadhesive layer40 has good adhesion properties to the semiconductor chip (silicon) from the standpoint of having a lower content rate of a filler than the molding resin described below. For example, 20 to 40% (for example, 30%) fillers with a diameter of about 5 μm are contained in resin without including the mold release material used as theadhesive layer40. In addition, in the embodiment, it is not always necessary to use a resin containing a filler as theadhesive layer40.
Also, as a suitable material of theadhesive layer40, there is a coupling material. Since a silane coupling material etc. have an organic functional group and a hydrolyzable group in one molecule, an inorganic substance (the semiconductor chip30) can be coupled to an organic substance (the molding resin described below) and adhesion properties between their substances can be improved.
The silane coupling material etc. are applied to the upper surface of thesemiconductor chip30 and heating treatment is performed for 0.5 hour in an atmosphere of temperature of 80° C. and thereafter, heating treatment is performed for 2 hours in an atmosphere of temperature of 200° C. and the silane coupling material etc. are cured and thereby, theadhesive layer40 is obtained.
In addition, theadhesive layer40 may be obtained by applying a resin without including a mold release material after surface treatment of the upper surface of thesemiconductor chip30 is performed by a coupling material.
The coupling material and the resin without including the mold release material are given as theadhesive layer40, but various adhesive (gluing) materials capable of adhesion between thesemiconductor chip30 and the molding resin can be used as long as a material without losing reliability of the semiconductor apparatus finally obtained is used.
Then, asecond wiring substrate50 as shown inFIG. 3B is prepared. Thesecond wiring substrate50 has a structure similar to that of thefirst wiring substrate10. That is, a through hole TH is disposed in acore substrate52 and the inside of the through hole TH is filled with a throughelectrode54. Wiring layers60 mutually connected through the throughelectrode54 are respectively formed on the sides of both surfaces of thecore substrate52. Further, solder resists56 in which openingparts56aare disposed on connection parts of the wiring layers60 are respectively formed on the sides of both surfaces of thecore substrate52.
Also in thesecond wiring substrate50, various wiring substrates such as a coreless wiring substrate can be used while the number of stacks of the wiring layer can be set arbitrarily like thefirst wiring substrate10.
Further, a conductive ball62xis installed on the connection part of thewiring layer60 of the lower surface peripheral edge side of thesecond wiring substrate50. The conductive ball62xis constructed by covering an outer surface of a copper ball62awith asolder layer62b. Since thesemiconductor chip30 is received in a receiving part constructed of thefirst wiring substrate10 and thesecond wiring substrate50, a height (diameter) of the conductive ball62xis set higher than a height (the total thickness of thesemiconductor chip30 and the connection electrode32) of thesemiconductor chip30.
Then, the conductive ball62xof the lower surface side of thesecond wiring substrate50 is arranged on the connection part of thewiring layer20 of the peripheral edge side of thefirst wiring substrate10. Further, the conductive ball62xis bonded to the wiring layers20,60 of the first andsecond wiring substrates10,50 by melting thesolder layer62bby reflow heating. Or, the conductive ball62xmay be installed on the side of thefirst wiring substrate10 and thesecond wiring substrate50 may be arranged on the conductive ball62x.
Consequently, thewiring layer20 of thefirst wiring substrate10 is electrically connected to thewiring layer60 of thesecond wiring substrate50 by abump electrode62 as shown inFIG. 3C. At the same time, thesemiconductor chip30 is received in a receiving part A surrounded by thebump electrodes62 between thefirst wiring substrate10 and thesecond wiring substrate50. The first embodiment is in a state of disposing a gap d between an upper surface of theadhesive layer40 on thesemiconductor chip30 and a lower surface of thesecond wiring substrate50.
In this manner, astacked wiring member2 constructed by stacking thesecond wiring substrate50 on thefirst wiring substrate10 on which thesemiconductor chip30 is mounted by flip chip bonding is obtained.
Then, amolding mold70 basically constructed by alower mold72 and anupper mold74 is prepared as shown inFIG. 4. Themolding mold70 is a metal mold for being filled with a molding resin by a transfer molding construction method. A recessedpart72acorresponding to thefirst wiring substrate10 of the stackedwiring member2 is disposed in the upper surface side of thelower mold72. Also, a recessedpart74acorresponding to thesecond wiring substrate50 of the stackedwiring member2 is disposed in the lower surface side of theupper mold74.
Then, the stackedwiring member2 is arranged in the recessedpart72aof thelower mold72 and theupper mold74 is arranged on thelower mold72 so as to receive thesecond wiring substrate50 of the stackedwiring member2 in the recessedpart74aof theupper mold74.
By pinching the stackedwiring member2 by thelower mold72 and theupper mold74 in this manner, the receiving part A between thefirst wiring substrate10 and thesecond wiring substrate50 becomes a cavity C filled with a resin. Also, a gap is disposed between thelower mold72 and theupper mold74 in the outside of one end of the stackedwiring member2 and the gap forms a resin supply part B (a molding gate) connected to the cavity C. It is constructed so that a melted resin passes through the resin supply part B and flows into the cavity C.
By the transfer molding construction method using such amolding mold70, the melted resin is allowed to flow into the side of the cavity C through the resin supply part B. After the whole cavity C is filled with the resin, theupper mold74 and thelower mold72 are detached from the stackedwiring member2 and a gate resin part formed in the resin supply part B is broken off and thereby, the gate resin part is separated from the resin with which the inside of the cavity C is filled.
Consequently, a gap between thefirst wiring substrate10 and thesecond wiring substrate50 is filled with amolding resin76 and thesemiconductor chip30 is sealed with the resin as shown inFIG. 5. A mold release material (wax) is included in themolding resin76 used by the transfer molding construction method in order to be easily detached from themolding mold70. Therefore, when themolding resin76 is directly formed on the mirror surface in the case of performing polishing processing of the upper surface of thesemiconductor chip30, adhesion properties are low and peeling at its interface tends to occur.
As the mold release material (wax), there is a natural material or a chemical synthetic material. As the natural material, for example, there is carnauba wax obtained by using wax present on a surface of a leaf of a palm plant as a raw material.
Also, 65 to 85% (for example, 75%) fillers with a diameter of about 30 μm are contained in themolding resin76 and adhesion properties to thesemiconductor chip30 tend to be low from the standpoint of a small resin component.
However, in the embodiment, theadhesive layer40 is disposed on the upper surface of thesemiconductor chip30, so that themolding resin76 is formed on theadhesive layer40 with sufficient adhesion properties. As a result of that, themolding resin76 is formed with sufficient adhesion properties to thesemiconductor chip30 by a function of theadhesive layer40.
Thereafter,external connection terminals78 are disposed by, for example, installing solder balls in the connection parts of thewiring layer20 of the lower surface side of thefirst wiring substrate10.
By the above, a resin-sealed semiconductor apparatus1 of the first embodiment is obtained as shown inFIG. 5.
As shown inFIG. 5, theconnection electrode32 of thesemiconductor chip30 is mounted on thewiring layer20 of the upper surface side of thefirst wiring substrate10 described inFIG. 2A by flip chip bonding in the semiconductor apparatus1 of the first embodiment. A gap between the lower portion of thesemiconductor chip30 and the upper surface of thefirst wiring substrate10 is filled with theunder fill resin18. Polishing processing of the upper surface of thesemiconductor chip30 is performed and surface roughness (Ra) of its mirror surface becomes about 10 μm and the surface is smoothed.
Theadhesive layer40 is formed on the upper surface (mirror surface) of thesemiconductor chip30. As theadhesive layer40, for example, a coupling material or a resin without including a mold release material is used.
Thesecond wiring substrate50 described inFIG. 3B is stacked and arranged on thefirst wiring substrate10 through thebump electrode62. Thewiring layer20 of thefirst wiring substrate10 is electrically connected to thewiring layer60 of thesecond wiring substrate50 through thebump electrode62.
A height of thebump electrode62 is set higher than a height of thesemiconductor chip30, and thesemiconductor chip30 is received between the first andsecond wiring substrates10,50. A gap between the first andsecond wiring substrates10,50 is filled with themolding resin76 and thesemiconductor chip30 is sealed with themolding resin76.
Thus, theadhesive layer40 is formed on the upper surface (mirror surface) of thesemiconductor chip30 and the top of theadhesive layer40 is filled with themolding resin76. That is, themolding resin76 is interposed between an upper surface of theadhesive layer40 on thesemiconductor chip30 and a lower surface of thesecond wiring substrate50.
Consequently, themolding resin76 is formed with sufficient adhesion properties to thesemiconductor chip30 through theadhesive layer40.
Therefore, even when the semiconductor apparatus1 absorbs moisture and the moisture gathered at an interface between different materials evaporates (vaporizes) by heating treatment and thereby volume expansion is caused, thesemiconductor chip30, theadhesive layer40 and themolding resin76 adhere mutually by high adhesion force, so that peeling is prevented from occurring at their interfaces.
As a result of that, reliability in the case of actually using the semiconductor apparatus1 can be improved while a yield can be improved in moisture absorption and heating tests of the semiconductor apparatus1.
Second EmbodimentFIGS. 6 and 7 are sectional views showing a manufacturing method of a semiconductor apparatus of a second embodiment of the invention.
The second embodiment is characterized in that a semiconductor chip is made to adhere to a second wiring substrate directly by an adhesive layer without interposing a molding resin between an upper surface (mirror surface) of the semiconductor chip and a lower surface of the second wiring substrate.
In the second embodiment, the detailed description is omitted by assigning the same numerals to the same elements and the same steps as those of the first embodiment.
In the manufacturing method of the semiconductor apparatus of the second embodiment, the same structural body as that ofFIG. 2C of the first embodiment described above is prepared as shown inFIG. 6A. That is, after asemiconductor chip30 is mounted in afirst wiring substrate10 by flip chip bonding, a gap between a lower portion of thesemiconductor chip30 and an upper surface of thefirst wiring substrate10 is filled with an underfill resin18.
Then, anadhesive material40ais applied to an upper surface (mirror surface) of thesemiconductor chip30 as shown inFIG. 6B. As theadhesive material40a, the resin without including the mold release material (wax) described in the first embodiment is suitably used.
Subsequently, as shown inFIG. 6C, asecond wiring substrate50 in which conductive balls62xare installed on the lower surface side is stacked and connected on thefirst wiring substrate10 like the step ofFIG. 3B of the first embodiment. In the second embodiment, the application amount (volume) of theadhesive material40aor a diameter of the conductive ball62xinstalled on thesecond wiring substrate50 is adjusted so that a gap does not occur by making contact between theadhesive material40aon thesemiconductor chip30 and a lower surface of thesecond wiring substrate50.
Or, theadhesive material40amay be formed using a coupling material as a main material. In this case, for example, an adhesive in which the coupling material is included is used and its application amount (volume) or a diameter of the conductive ball62xinstalled on thesecond wiring substrate50 is adjusted.
Consequently, as shown inFIGS. 6(c) and7(a), the uncuredadhesive material40aon thesemiconductor chip30 is pushed in a lateral direction by thesecond wiring substrate50 and flows and a gap between the upper surface (mirror surface) of thesemiconductor chip30 and the lower surface of thesecond wiring substrate50 is filled with theadhesive material40a.
Further, anadhesive layer40 is obtained by heat-treating and curing theadhesive material40a. Also at the same time, awiring layer20 of thefirst wiring substrate10 is electrically connected to awiring layer60 of thesecond wiring substrate50 through abump electrode62.
In the second embodiment, a gap is not disposed between thesecond wiring substrate50 and theadhesive layer40 on thesemiconductor chip30, and thesemiconductor chip30 is received in a receiving part A between the first andsecond wiring substrates10,50 in a state of filling a gap between thesecond wiring substrate50 and an upper surface of thesemiconductor chip30 with theadhesive layer40.
Further, as shown inFIG. 7B, the receiving part A (cavity) between the first andsecond wiring substrates10,50 is filled with amolding resin76 by a transfer molding construction method similar to that of the first embodiment. The receiving part is filled with themolding resin76 so as to surround thesemiconductor chip30 and theadhesive layer40.
Consequently, asemiconductor apparatus1aof the second embodiment is obtained. The second embodiment has an effect similar to that of the first embodiment.
In the first embodiment described above, a gap between theadhesive layer40 on thesemiconductor chip30 and the solder resist56 of the lower surface of thesecond wiring substrate50 is filled with themolding resin76. In the first embodiment, adhesion properties between thesemiconductor chip30 and themolding resin76 are improved by theadhesive layer40, but the case where adhesion properties between themolding resin76 and the solder resist56 of thesecond wiring substrate50 are not always obtained sufficiently depending on their materials is assumed.
In the second embodiment, filling with theadhesive layer40 is performed without interposing themolding resin76 between the upper surface (mirror surface) of thesemiconductor chip30 and the lower surface side of thesecond wiring substrate50.
Therefore, even when adhesion properties between themolding resin76 and the solder resist56 of thesecond wiring substrate50 are not obtained sufficiently, the solder resist56 is arranged with sufficient adhesion properties to thesemiconductor chip30 by theadhesive layer40 and a strength of adhesion between first andsecond wiring substrates10,50 can be reinforced.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Accordingly, the scope of the invention should be limited only by the attached claims.